Abstract
A generalizable procedure for production of pure enantiomeric chelating phosphanes is based on the surprisingly facile resolution of the corresponding phosphane oxides—(±)-norphosO in this case—with L-()-dibenzoyltartaric acid. (+)- and ()-norphosO (optically pure after two separation steps) can reduced by SiHCl3 to (+)- and () norphos, respectively, which from valuable catalysts for asymmetric hydrogenation with Rh compounds.
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